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2268. Minimum Number of Keypresses You have a keypad with 9 buttons, numbered from 1 to 9, each mapped to lowercase English letters. You can choose which characters each button is matched to as long as: All 26 lowercase English letters are mapped to. Each character is mapped to by exactly 1 button. Each button maps to at most 3 characters. To type the first character matched to a button, you press the button once. To type the second character, you press the button twice, and so on. Given a st...